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TECHNICAL PAPERS

Finite-Element Modelling of Multi-Planar Offshore Tubular Joints

[+] Author and Article Information
Marcus M. K. Lee

School of Civil Engineering and the Environment, University of Southampton, Highfield, Southampton SO17 1BJ, U.K.

Ellen M. Dexter

Formerly of Department of Civil Engineering, University of Wales Swansea, U.K.

J. Offshore Mech. Arct. Eng 126(1), 120-128 (Mar 02, 2004) (9 pages) doi:10.1115/1.1643388 History: Received September 01, 2002; Revised March 01, 2003; Online March 02, 2004
Copyright © 2004 by ASME
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References

American Petroleum Institute, 1993, “Recommended Practice Planning, Designing and Constructing Fixed Offshore Platforms,” 20th edition, API RP2A, Section E, Connections.
ISO, 1999, “Petroleum and Natural Gas Industries—Offshore Structures—Part 2: Fixed Steel Structures,” BS EN ISO 13819-2.
BOMEL, 1996, “Design and reassessment of tubular joints for offshore structures,” Chapter 3: Static Strength, BOMEL report C6060R07.21.
Lalani, M., 1990, “Codification of Tubular Joints Design Practice—A plea for rationalization,” Proceedings of the 9th International Conference on Offshore Mechanics and Arctic Engineering, Houston, Texas, pp. 667–675.
American Welding Society, 1990, “ANSI/AWS D1.1-90 Structural Welding Code—Steel,” 12th edition, Section 10, Tubular Structures.
Marshall, P. W., 1992, “Design of Welded Tubular Connections—Basis and Use of AWS Code Provisions,” Elsevier.
Wilmshurst, S. R. and Lee, M. M. K., 1995, “Static Strength of Multi-Planar KK-Joints—a Reassessment of the Database and Estimation Equation.” Proceedings of the 14th International Offshore Mechanics and Arctic Engineering Conference, Copenhagen, pp. 181–191.
Lalani, M. and Bolt, H. M., 1989, “Strength of Multi-Planar Joints on Offshore Platforms,” Proceeding of International Symposium on Tubular Structures, Lappeenranta, Finland, pp. 90–102.
Kurobane, Y., 1996, “Ultimate Behavior and Design of Multi-Planar Tubular Joints,” Fatigue in Offshore Structures, Ed. Rao & Dover, Oxford and IBH Publishing.
Lee, M. M. K. and Dexter, E. M., 1999, “A New Capacity Equation for Axially Loaded Multi-Planar Tubular Joints in Offshore Structures,” Final Report for Joint Industry Project.
Lee,  M. M. K., Dexter,  E. M., and Kirkwood,  M. G., 1995, “Strength of Moment Loaded Tubular T/Y Joints in Offshore Platforms,” The Structural Engineer, 73(15), pp. 239–246.
Lee,  M. M. K., and Wilmshurst,  S. R., 1995, “Numerical Modelling of CHS Joints with Multi-Planar Double-K Configuration,” J. Constr. Steel Res., 32, pp. 281–301.
Lee,  M. M. K., and Wilmshurst,  S. R., 1996, “A Parametric Study of Strength of Tubular Multiplanar KK-Joints,” J. Struct. Eng., 122(8), pp. 893–904.
Lee,  M. M. K., and Llewelyn-Parry,  A., 1999, “Strength of Ring-Stiffened Tubular T-joints- a Parametric Numerical Study,” J. Constr. Steel Res., 51, pp. 239–264.
Dexter,  E. M., and Lee,  M. M. K., 1999, “Static Strength of Axially Loaded Tubular K-Joints I: Behavior,” J. Struct. Eng., 125(2), pp. 194–201.
Gazzola,  F., Lee,  M. M. K., and Dexter,  E. M., 2000, “A Design Equation for Overlap K-Joints Under Axial Loading,” J. Struct. Eng., 126(7), pp. 798–808.
ANSYS, 1992, “Users’ Manuals,” Swanson Analysis Systems Inc.
van der Vegte, G. J., 1995, “The Static Strength of Uniplanar and Multi-Planar Tubular T-and X-Joints,” Ph.D. Thesis, Delft University of Technology, Netherlands.
ABAQUS, 1996, “Users’ Manuals” Hibbit, Karlsson and Sorensen Inc.
Yura,  J. A., Zettlemoyer,  N., and Edwards,  I. F., 1981, “Ultimate Capacity of Circular Tubular Joints,” J. Struct. Div. ASCE, 107, ST10, pp. 1965–1982.

Figures

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Typical joint meshes of increasing complexity created using modular mesh generation
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Notation for a typical tubular joint
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Boundary conditions for chord and brace ends
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Material curve used in finite element study
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Definition for the brace end displacement
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Load-displacement responses for compression-loaded T and Y joints
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Comparison of FE results for compression loaded T joints with ISO predictions and BOMEL database
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Comparison of FE results for compression loaded Y joints with ISO predictions and BOMEL database
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Load-displacement responses for tension-loaded joints a. β=0.5,γ=10b. β=0.5,γ=26
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The post-ultimate deformed shape for T joint β=0.5,γ=10, under tension loading
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Comparison of 12.5% maximum principal strain failure criterion with ISO predictions and BOMEL database
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Comparison of 20% maximum principal strain failure criterion with ISO predictions and BOMEL database
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Comparison of twice elastic compliance failure criterion with ISO predictions and BOMEL database
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Comparison of FE results for balanced loaded K joints with ISO predictions and BOMEL database

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